This would be welcome news, but I'm not aware of it being a "feature" yet. I don't have Fin 25 to confirm this, though. The page you point to is for a "DEV" version of the manual, so hopefully it's coming very soon!

Aha. I got a bit carried away and didn't notice that this was a dev page...
I was actually even thinking of making my own Maestro SMUFLization, but it is beyond my knowledge so I guess I just have to wait some more!

Taking what's currently there of the Maestro family and SMuFL-izing it wouldn't be all that difficult. I'm just not sure it's worth doing since an official rendition with an expanded glyph set is already in the works.